JavaScript-Equality-Table | JavaScript equality comparison is a crazy thing | Learning library

by dorey CSS Version: Current License: CC-BY-SA-4.0

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | JavaScript-Equality-Table Summary

JavaScript-Equality-Table is a CSS library typically used in Tutorial, Learning, Example Codes applications. JavaScript-Equality-Table has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has medium support. You can download it from GitHub.

JavaScript equality comparison is a crazy thing, sometimes. When in doubt, use three equals signs.

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JavaScript-Equality-Table has a medium active ecosystem.

It has 1200 star(s) with 187 fork(s). There are 15 watchers for this library.

It had no major release in the last 6 months.

There are 6 open issues and 8 have been closed. On average issues are closed in 279 days. There are 2 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of JavaScript-Equality-Table is current.

Quality

JavaScript-Equality-Table has no bugs reported.

Security

JavaScript-Equality-Table has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

JavaScript-Equality-Table is licensed under the CC-BY-SA-4.0 License. This license is Strong Copyleft.

Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

Reuse

JavaScript-Equality-Table releases are not available. You will need to build from source code and install.

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JavaScript-Equality-Table Key Features

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JavaScript-Equality-Table Examples and Code Snippets

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Community Discussions

Trending Discussions on JavaScript-Equality-Table

Why isNaN([3]) is false in JavaScript?

Implementing JavaScript function areDifferent(oldValue, newValue) to compare emptiness human-like style

QUESTION

Why isNaN([3]) is false in JavaScript?

Asked 2019-Jul-22 at 03:07

I use Chrome browser 60.x, and test the code isNaN([3]). The result is false, but I cannot understand it.

[3] is an Array, and it is not empty. I think [3] is array object, and it is not an number.

Otherwise the result of isNaN(["ABC"]) is true. And another result of isNaN([1,2,3]) is true. So I guess javascript engine is force changing array to number which the array has a single element.

Please let me know what is happened isNaN function for array parameter.

ref1: Why is isNaN(null) == false in JS?
ref2: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN

[EDIT] Thank you everyone for answering.

I understand javascript parsed the value implicitly before comparison.

And I found a useful link while reading Nina Scholz's answer.
The comparison table : http://dorey.github.io/JavaScript-Equality-Table/

...

ANSWER

Answered 2017-Sep-04 at 07:20

When you use isNaN it tries to parse your input value into the number and then checks if it is NaN or not.

See some examples.

For an array with one item, the Number() function returns an object, which actually hold the first item as a value (see console.log). For many items it returns NaN, so you get isNaN's result -> true.

Source https://stackoverflow.com/questions/46031676

QUESTION

Implementing JavaScript function areDifferent(oldValue, newValue) to compare emptiness human-like style

Asked 2017-Apr-03 at 13:03

I'm getting and object from the back-end with some properties and use AngularJS to put them into input fields (inputs, textareas, checkboxes, dropdown lists).

These properties are in some cases a text value, in some a number value but can also be null, undefined, false or "".

I clone this object and then check if user is making any modifications to each of these values by comparing the old (stored) value with new (current) one.

I don't want to use the ng-dirty class for detecting a change because it does not disappear when you go back to the previous value after a prior modification (e.g. when using Ctrl+Z).

I thought this task would be simple however I'm getting trouble with this due to ambiguous nature of JS values.

Of course I treat every of these:

null
undefined
false
""

an "empty value" because for user "an empty field is an empty field", regardless of what the model stores underneath. So, for example, a change from undefined to "" is not really a change.

So far I've got this:

...

ANSWER

Answered 2017-Apr-03 at 13:03

You could use exclusive OR and check the values with

Source https://stackoverflow.com/questions/41701570

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install JavaScript-Equality-Table

You can download it from GitHub.

Support

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